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Instructor: I wanna add a quick note

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about this spacing that we see in this code.

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Now, this isn't just for Python.

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In other languages, you'll always see this.

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You're not going to see that every single line of code

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always starts, as well, in the first space.

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Different languages will use this differently,

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but in order to organize code,

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usually you'll see some indentation like this.

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Now, Python, however, is unique

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because the indentation and spaces that we see here

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makes the interpreter see it and say,

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"Hey, this means something."

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The interpreter would actually see the space

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and say, "Because there's space here,

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I know that this is part of the if block."

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In other languages, like JavaScript,

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well you have something similar,

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but usually you'll have an if statement

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and then some condition followed by,

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make sure I spell condition right,

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followed by something like a curly brace.

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And in here, whatever is in here,

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you can see that I still get the space

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and I can do whatever I want.

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But, JavaScript interpreter

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doesn't really care that there's spaces.

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If I want, I could write my code just on one line like this

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and it's still valid in JavaScript code.

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So people usually do the spacing more for style purposes.

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Python, on the other hand,

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is not just for styling that we do this

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but because the interpreter

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actually finds meaning in the spaces,

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which is actually one of the big selling point with Python.

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It's very clean.

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There's no extra stuff here that makes it difficult.

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I mean, it's just English, right?

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If is_old and if is_licensed, then print this.

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It's just really nice to read and really clean.

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Now, if you notice here, my editor,

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and we're gonna talk about editors and IDs

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in an upcoming section,

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but if you are using the proper tools,

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this automatically is created for you.

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Now, in the programming world,

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there's this debate about tabs and spaces,

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and we're not going to get into it.

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It's frankly a little bit silly.

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That is some people prefer to,

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here if they want to create a space,

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they might use spaces or they might use tabs.

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At the end of the day, with Python,

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the rule is we can use spaces, you can use the tab,

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but the idea that if you use spaces,

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you usually use four spaces.

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It's just a standard.

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Now, if you notice here, I actually don't have four spaces.

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It's two spaces here.

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And that is because up until now, well,

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I've just been following along whatever this editor gives me

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but if you look over here, there's an auto format button.

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If I click on this, it automatically formats my code

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into the appropriate format.

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And you see right over here that I now have for spaces.

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But you see that the code still works.

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Again, it's because at the end of the day,

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the important part is that there's a distinction

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between hierarchies.

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That is the top and then maybe the children.

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But the interpreter itself is going to notice these spaces.

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So you do have to be careful

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because based on where this print is,

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as soon as I add a tab in here and I click run,

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well, I get is_old and is_licensed.

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But as soon as one of this is false and I click run,

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you see that okok runs only if this condition fails.

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Again, if previously both of these were true,

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I only get the first line printed.

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So that little space here changes the outcome of my program.

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So you have to really be careful with this

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and luckily your editor, or where you code,

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is going to help you out with this.

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But it is a gotcha

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that if you're just starting out, you wanna be mindful of.

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All right, no more debates about spaces and tabs.

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I'll see you in the next video.

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Bye-bye.